一、问题引入
Linux网络编程：socket & fork()多进程 实现clients/server通信 随笔介绍了通过fork()多进程实现了服务器与多客户端通信。但除了多进程能实现之外，多线程也是一种实现方式。
重要的是，多进程和多线程是涉及操作系统层次。随笔不仅要利用pthread_create()实现多线程编程，也要理解线程和进程的区别。
二、解决过程
client 代码无需修改，请参考 Linux网络编程：socket & fork()多进程 实现clients/server通信
2-1 server 代码
#include <stdlib.h>
#include <pthread.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <sys/syscall.h>
#define IP "10.8.198.227"
#define PORT 8887
#define gettid() syscall(__NR_gettid)
#define PTHREAD_MAX_SIZE 3 // 允许最大客户端连接数
typedef struct PTHREAD_DATA_ST
{
pthread_t pthread_id;
int connfd;
char socket[128];
struct sockaddr_in cliaddr;
}PTHREAD_DATA_ST;
//static int g_pthread_num = 3; // 允许最大客户端连接数
static struct PTHREAD_DATA_ST g_pthread_data[PTHREAD_MAX_SIZE];
static void pthread_data_index_init(void)
{
for (int i = 0; i < PTHREAD_MAX_SIZE; i++)
{
memset(&g_pthread_data[i], 0 , sizeof(struct PTHREAD_DATA_ST));
g_pthread_data[i].connfd = -1;
}
}
static int pthread_data_index_find(void)
{
int i;
for (i = 0; i < PTHREAD_MAX_SIZE; i++)
{
if (g_pthread_data[i].connfd == -1)
break;
}
return i;
}
static int string_toupper(const char *src, int str_len, char *dst)
{
int count = 0;
for (int i = 0; i < str_len; i++)
{
dst[i] = toupper(src[i]);
count++;
}
return count;
}
void *pthread_handle(void *arg)
{
struct PTHREAD_DATA_ST *pthread = (struct PTHREAD_DATA_ST *)arg;
int connfd = pthread->connfd;
int recv_len, send_len;
pid_t tid = gettid();
char read_buf[1024], write_buf[1024];
while (1)
{
memset(read_buf, 0, sizeof(read_buf));
memset(write_buf, 0, sizeof(write_buf));
recv_len = read(connfd, read_buf, sizeof(read_buf));
if (recv_len <= 0)
{
printf("%s close, child %d terminatedn", pthread->socket, tid);
close(connfd);
pthread->connfd = -1;
pthread_exit(NULL);
}
printf("%s:%s(%d Byte)n", pthread->socket, read_buf, recv_len);
send_len = string_toupper(read_buf, strlen(read_buf), write_buf);
write(connfd, write_buf, send_len);
if (strcmp("exit", read_buf) == 0)
{
printf("%s exit, child %d terminatedn", pthread->socket, tid);
close(connfd);
pthread->connfd = -1;
pthread_exit(NULL);
}
}
}
int main(void)
{
int listenfd, connfd;
struct sockaddr_in server_sockaddr;
struct sockaddr_in client_addr;
char buf[1024];
char client_socket[128];
socklen_t length;
int idx;
int opt = 1;
server_sockaddr.sin_family = AF_INET;
server_sockaddr.sin_port = htons(PORT);
server_sockaddr.sin_addr.s_addr = inet_addr(IP);
listenfd = socket(AF_INET, SOCK_STREAM, 0);
if (listenfd < 0)
{
perror("socket error");
exit(1);
}
// 设置端口复用
setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
if (bind(listenfd, (struct sockaddr *)&server_sockaddr, sizeof(struct sockaddr)) < 0)
{
perror("bind error");
exit(1);
}
if (listen(listenfd, 5) < 0)
{
perror("listen error");
exit(1);
}
pthread_data_index_init();
while (1)
{
// 接受来自客户端的信息
printf("accept start n");
memset(&client_addr, 0, sizeof(client_addr));
length = sizeof(client_addr);
if ((connfd = accept(listenfd, (struct sockaddr *)&client_addr, &length)) < 0)
{
if (errno == EINTR)
continue;
else
{
perror("accept error");
exit(1);
}
}
idx = pthread_data_index_find();
if (idx == PTHREAD_MAX_SIZE)
{
printf("client connected upper limit, refused connectn");
close(connfd);
continue;
}
memset(&client_socket, 0, sizeof(client_socket));
printf("client addr:%s por:%dn",
inet_ntop(AF_INET, &client_addr.sin_addr, buf, sizeof(buf)),
ntohs(client_addr.sin_port));
snprintf(client_socket, sizeof(client_socket), "client socket (%s:%d)",
inet_ntop(AF_INET, &client_addr.sin_addr, buf, sizeof(buf)),
ntohs(client_addr.sin_port));
g_pthread_data[idx].connfd = connfd;
g_pthread_data[idx].cliaddr = client_addr;
strcpy(g_pthread_data[idx].socket, client_socket);
pthread_create(&(g_pthread_data[idx].pthread_id), NULL, pthread_handle, &(g_pthread_data[idx]));
pthread_detach(g_pthread_data[idx].pthread_id);
}
close(listenfd);
return EXIT_SUCCESS;
}
2-2 编译运行
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